NGC 2808 - Southern Gems Collection (Fabian Rodriguez Frustaglia)

Celestial hemisphere: Southern · Constellation: Carina (Car) · Contains: NGC 2808

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NGC 2808 - Southern Gems Collection

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NGC 2808 - Southern Gems Collection

It had been thought that NGC 2808, like typical globular clusters, contains only one generation of stars formed simultaneously from the same material. A team of astronomers investigated Hubble Space Telescope images of NGC 2808 taken with Hubble's Advanced Camera for Surveys. Unexpectedly, they found that this cluster is composed of three generations of stars, all born within 200 million years of the formation of the cluster.

Astronomers have argued that globular clusters can produce only one generation of stars, because the radiation from first generation stars would drive the residual gas not consumed in the first star generation phase out of the cluster. However, the great mass of a cluster such as NGC 2808 may suffice to gravitationally counteract the loss of gaseous matter. Thus, a second and a third generation of stars may form.

An alternative explanation for the three star generations of NGC 2808 is that it may actually be the remnant of a dwarf galaxy that collided with the Milky Way.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	4561126
PixInsight job	6XMYJQ60KHYX5AH1IQGXFJS4YKDAFIZ4
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h12m02s.641
RA (top/left)	09h14m03s.249
RA (top/right)	09h10m03s.913
RA (bottom/right)	09h10m03s.270
RA (bottom/left)	09h13m59s.999

Dec (center)	-64°52′00″.85
Dec (top/left)	-65°01′09″.92
Dec (top/right)	-65°01′27″.39
Dec (bottom/right)	-64°42′47″.45
Dec (bottom/left)	-64°42′29″.16

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NGC 2808 - Southern Gems Collection

NGC 2808 - Southern Gems Collection

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Image Index:

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NGC 2808 - Southern Gems Collection

NGC 2808 - Southern Gems Collection

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